DS Queues

A ds_queue is a first-in-first-out data
structure.

A ds_queue is somewhat similar to a ds_stack but it works on a first-in
first-out (FIFO) basis. The value that is put into the queue
first is also the first to be removed from it. You can think
of it like a queue in a shop for paying, where the person that is
first in the queue pays first and then leaves the shop. Queues are
typically used to store actions or behaviours (in the form of
scripts, for example) that still need to be done by an instance but
there are many other uses.

NOTE: As with all dynamic resources, data structures take
up memory and so should always be destroyed when no longer
needed to prevent memory leaks which will slow down and eventually
crash your game.